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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befa87fec8f13c1f058dc9dda730877c78372b553bdf85eb08e3dd27f5a6de08' 
  AND token = 'hromQ6yxT1FeLmA8vYuWPe/5v5FfEEWv02oXOhPGV9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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