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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d0f184a6f3a99ae110d7e844275ea3387e386f014ddbc53d4a19bef8ed26f6' 
  AND token = 'fDNmxRQmgvX6qxEXptjSoS4PqPeypIs8qK9JFGP5X3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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