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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c4e4049700fa2dbc551d0a72b25a5be9b43f58568959d15358fbafeb8c87ce' 
  AND token = 'G4J3TGlBkcm55X9OnYOc33fuaOEJ1a1bUAvN5EqYMnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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