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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da8aa0a738fd8a5f1f811a3451a6cfa66eed8bf5985518dc4e7e9fd0891fe50' 
  AND token = 'XrF4grdzQafV/Fh5XDIfckxkz4KVzKa6NmOf/ddI9MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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