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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a77e36465e29c3905457a69b999976197304f7cd347f771622ad87bd89fa71' 
  AND token = '+0bWsK91rFehxTWe/qBc2woB+05qZHBEl1vq03R2/K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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