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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171035db45a35c6d8b9992ab9c5213ee8ce01f9e2b248306c5cd70e32e4443fb' 
  AND token = 'NWxNqYEAPySZu9dSTD0fVHBKedoq+Z1vC0f4S3sUIMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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