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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0ae8756d933e190a85d42651fe4894c1dbf42c871b4323c953eece0f43c21b' 
  AND token = '4Om5rUtVKp49m2kkzqf59WkOG1kxnQDJCJ4XxcLXu5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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