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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e411d7d863dbaea87992c905635460677247c541aebc6ea857cf92c27074e2' 
  AND token = '9wWtje/JaDJp0wLBi9Q5oIwXCFrEvGUiKiupi/xETN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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