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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4d735eb76e580e7903d7b083a09fac3775caf45c76b656bad89ce70efd6254' 
  AND token = 'xX5jef1wFNNp8RXBTXekbPoArTqmFfBEIa0YygvMiw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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