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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f076ee0b4c4cb46272a51cac84e214e87018e37e985266b79481fe546e939a6e' 
  AND token = 'm/+EwzeV/3xFhw+69P+rLJdtB7DvMy1js1AjPkIY8k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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