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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96824901bbfd13bd44797317af04f5d758e4127df69ba6cf605e853e46abff63' 
  AND token = 'Hx9ZQ0WWudqRmAE0/+8877prxCfkb6wKJH9mifT9le4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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