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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d81ca2484198f509d8e8c9ebf394814abae37a823a714eba6791f0d28488636' 
  AND token = '2+TCTTwfIqK5oJw/VS5E4nMI88e0W38pp+LugjroYgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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