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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4e587f40ce199942510f138cba7c724204b74c3ed4735c26af293970cf8d8e' 
  AND token = 'Uoml8HfQOh0lqcbff+Ho93f67BKweV7cW10etB6dAxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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