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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbc91326f1eb5dbc809cd782286cb6411891305d1125586b853684c39e5d776' 
  AND token = 'RjkU+T9TW/EReW6OUV+AhC696vjMf1wCDE7DseMeolA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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