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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0568b26174327f7ad65ee90ef24812fa6ace3e2666adc4f05e43da54f6e1127c' 
  AND token = 'uBpoOOKQ3D/f6/CsCpcGq2mmRHDp9XMAhQHYT+XsH/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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