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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb751f6dcff1fe0f60b97291a2f1a4f69a4c7c91e33352bc953c4d5c8ac02ca' 
  AND token = 'Z6FxUFU1VVQVQWmLFkS5cpmEG5q5m7YvVbpk19oWECc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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