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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12edd3968d32942a5309c24c26c8d14fc1f09ba44b2bf4dca1b514350793ed30' 
  AND token = 'gL877dOinCnqw3lTzyrfnAvBZ7eNFMjMldiMMn7ZnA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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