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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cd29a57d534d3d172c42949bfd41678df0fd3ab503ee5ebe6268f9a824c934' 
  AND token = 'dxhX695Gt02UPem7LxySk774ae6qKl/YLd1CB+8O58w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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