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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980fbae66f303af62505503759bba9de3cd6d8f49d420e1507a1198f57f4d7b7' 
  AND token = '12LyvG8Ueg/7kmch4lQFFs0I83VPSZrGFR3mxlB/By4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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