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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b28e3c108850f8f3d07ac1b665a277eae0037e9ded495df044297e2efa9334' 
  AND token = 'gvI03ZOJt5rt4vZEvrNX9ReftCiXOD8nrcWypaN0PNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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