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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc3dc71c991240836f01c3ab9a61b6b25fb3f0996bc2f20b57cf5abcb9365bc' 
  AND token = 'TNXhNPRtYluFdtm6UzaMV7FP0oDKKRmWFvnMMyH557w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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