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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329069c558ccb0937905160265ae0a1cd0d07c722614183e190f7ba492980d2d' 
  AND token = '7g8KJ5uY12MspZZxtwqQlOq2Wgd7OLoEk9L/LpWGt50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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