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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd97cadda1e5afaf4b74841abc41d9626636f00fb6a0cf3eab2a67a7b0d3b2a0' 
  AND token = '30oRH7GvEE8cZAX7NEf93HwH/748U2aCqqQk2Rspwes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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