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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc76711bd16644a49db6dcb63b8a90dfffe5d8f5aec55a5e867d2dc9d76e20c' 
  AND token = 'numT68TJLN1zU/NGIHbdNEvlIsw/xlZkoFGUtjMYk0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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