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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e464d55aa385ef289d86e57381f7ca64fc61018e9d1dc71d08fa06dc98cbc76' 
  AND token = '4Bv60qZa3TtSnzQJ7ii4/etAW6OLjfzVuhkPnDTmnWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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