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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81a10ff0d0c18d78814eca1dac4bad6295074869529fcaa61cc76086ce3f62b' 
  AND token = 'iAjfh6ta7g0rsAlSLfZqMl3DeAr9iO6j0vU3coz8oH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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