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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db67d96072fd486e114c406a5c35fe84ca0e5f6ee5e193e5d9edd9665e891d19' 
  AND token = '3R8T0TQShA8w8H35CvJp257fJ7aibTgHOPgf0y2LdHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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