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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91aa01297099d0f1affd606aceca0b43268ac864e24bb38e1fe2b7b4570e5833' 
  AND token = 'fjvJpjog4PC6v+A42W2/4U4IHnvefIvrkMQV17Iabyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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