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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056aa48f428943ef64b55819ac8ee4d8ac57512ae416d20f86a207e2e7a301fa' 
  AND token = 'FmYQHIzZ0GEpdgPO1g2+Rc5f3V5cgtmy2Bk3W+Do0jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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