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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdc8d0d5508987fc94a597a467b7832451bdd5b353096f9e13a735b1165bd59' 
  AND token = 'WydA0ZY7OdpbWSACcu964WDhYchVuNJt5wt3g8ipCMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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