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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609c1855c96cbdbb37e6ce352089a5db1c030dc9eadc339a593653257d7c291d' 
  AND token = 'RhRiHMNhuTFPHugyMqMco9rKrEDH6r+JaZM7hCwTbpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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