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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240532b189f599de49f5d99a4898cfe5f75c68f9b2b74a67d8e857ddb1826727' 
  AND token = 'ELfwLrj/uqSsNdDfdmr/yk5ee12CAxDm6E6YmJKdhCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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