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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f257ebacef875d4fdd0d4f3c5b33e5371b14cc9935d8e63785e3ef9d947d6fd' 
  AND token = 'hVbXHQsa2sf890olPiyWn8/y+h/xM6ltRk5vxhJzXyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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