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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1235980790e41b79d573647424d7903d3b70d9fbe508eae1019c27959622111d' 
  AND token = '6x2FhjYRZnMD+VvhXXWAwKp7J+1Y80/p8aM/MVnwR7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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