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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58968bfe46e6009d3d1d5d9e8c110d241c448c0a1f5d37055806fa2b1844350' 
  AND token = 'uZft/s3U03vdnJ6f7f8q4xCxyHJXuDjuY6/+nBABbSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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