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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9c4c6f7dab101bd504c32b6ab49b3f3545551a7a1d63b12a3d28001f19b3de' 
  AND token = 'vhQReD1e6QnxkUQW5veE5co63td6HmTfNOgD5Jj14og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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