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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5350a3ab871a2c6c4e11cb5f467de4a05c0497b8edfe007eabd5ae0bbf59696' 
  AND token = 'Loz8pR8LXtzYClf2PRdEMlDQmW+2Vg9O7wtEWUM9u6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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