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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d512a990643505e3f3c3e027bca6abf2f819309a8e40f10a5b3ee1d2638242' 
  AND token = 'IdmNHbNFyELl/ugYfYQ9eii86FXgWwwuWUV6hnXX9Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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