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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99959cc640a6951c5e531d0248e0639ac2dbd772102942c960fc55b37190d3e6' 
  AND token = 'kU1LfMLf/BlZdil74UZfup8R3nyqy3058skUAQlImfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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