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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c06e9cdfa6c43bfac081c0d5284044c7609765ff7f7df47759c999f5387050' 
  AND token = 'NzlLkKuKb2aF73lyIK3+ZhSJ1TVcYQqZpxoNCBuqeH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}