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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d08cc7e79e5ed32b207edae8231a42525e87c2a937099abd72ef32ec68f30b' 
  AND token = 'nmHgoRQWXrv5JCotAlYSw7mNQTamzSBPtLL3E+Rl3vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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