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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec8d3871fcf234d96997842f162c621918fc6dfd2c3dc96566cd614c1cb158f' 
  AND token = 'ojImu3pC7CM1esUziHyrBKIWXV3XB4S7zqlBT+UjFeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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