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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9451aa1c7461e99f630a61f6fda694143ea0618e7f512f8e17c7ace91d3700d' 
  AND token = 'Yi92nA7dOzzMDlzV7Sg5wi/CXIjl1fRD+8+8nYmfI5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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