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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094104d0994fd2b013300b83373c90d66dd1e95864b96023f20040e821b9637f' 
  AND token = 'K+qL6ym+0HEsSBHvdctWbfyUgv8i4lVnl9tAfyqv5Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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