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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bce3ecc18be5dcdaa499a06572273247a5606e82b464c5507a016d6eb38ce8' 
  AND token = 'b7CXLnqgz1G87+DKxpduhEy/zd9O6zJcu1J3FOhflp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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