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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672a93828681552bf42a156cf4c1395c46e51a193fadc36e37949ce053f84819' 
  AND token = 'qUUpK9m074nFFZ15fz3oXqj336Ak98xJKJUf1B4EvSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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