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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb00e83887de72b41886b13e5baf8f714694de918c54e8270f3e06d250fd822' 
  AND token = '+bM3fjn0lOB3btdSAZdkzqXdIMe3h2YXyNs3+85s3kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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