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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfef4982778fca1e7c91521c90b12fe5cd77d2ec7881da834aa596288269d10' 
  AND token = 'Jzhi98A9oT+OPsxWDNDhQNPKBwJeFyDIt5Nqe2Bj0v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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