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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2ade1ae7d984574a0a91c1892d031a3dcb32dcf95158cddcff10deab66eef1' 
  AND token = 'Pql9Mu2BOYfW+rxUUl9uLcMdhgpmgRZf9v1aeBZKIUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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