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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ae7c63d0dc0c8544f01b0057bcdbd136f1df70fbd441e94ec7e58e3e2a5896' 
  AND token = '2ufix8hX6033S+3hkftcwiY7Ym9uSqDHIqrSJZWNCXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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