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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d53667590a87d04f41b28897638a7d17d39f2b4ed8cd7b5980b165a0e9e1c87' 
  AND token = 'j+iyuduGwQcFbb+rZ83LOoatR1CATE2Rv4EQyq6tBu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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