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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc88bd2b99aada9ea197a2e213bf21e1d695e8165c0f23dbb88f84562132302f' 
  AND token = 'XT837fp3aGWM9utEp3phLHMpj3X+H6x91kIWURSvUdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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