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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15f9b212f4e970bc23d9ae6ea7665c19009e951ac73cd43e90c55938980f5af' 
  AND token = 'vKoR7UTe4+j71JxPS3Ll9w6bm/N2c4JXKR/tdxYJuKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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