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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e209731b756c24e7a8615d792a428618e21a2717fdcac7e8f88592f63da0a5bc' 
  AND token = 'TBhw75N6Ra9mLjRAy9VR8rNXgzMVjX0yQqNmDcrRnB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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