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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd611defb1958167523e5baaa0124d4504883fd7bde4974c6fa05cfeb4c56875' 
  AND token = 'D1WjFdH/v7E9i5cLjUvM3lE4xnM4Owr6KC6mX94l3t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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