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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8957d6d10ded6bb254bb279c0d93eeb2c611c6ec0a6f2114e705ee420b80d39e' 
  AND token = 'XHcS5x7cXaZQSjoyNKQG79TbF0NoaR7+U76nTssDX7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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