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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579cf5bb93286d0c037b686bff913bfad1257add3012fe1391b04e8fdca94d97' 
  AND token = 'SOd486y05orPy4GQ6tcqdBt4/+A0m7qWAwhQTmhmQAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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