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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de68e442c80ff345d82144ef625cc258504fcc161596eac1ec4e6dc2d247e8a' 
  AND token = 'TIrimsiCWarAPy1kDWBgr8lIV6kiljm8Vye/gWaYf+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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