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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd443050ad5cf80825aba6937e332e2700b7c73367f6302eba5f6a91d1327fabc' 
  AND token = 'giFTDGe0ngzvKtrljFIDCH0fxk8GMFaHkjUO9PRxKRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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