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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90fdef7d320ec25798c035dff2de2f97b5085b939ca33668e997c2540f96ba7' 
  AND token = 'IjsqHZfW2xGQAhXdk49PSmDj6L3cnRlTd5ImHXcYspU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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